A redundant circuit for automatically triggering a backup power supply

Abstract

The application relates to a redundancy circuit for automatically triggering a backup power supply and relates to the technical field of electronic circuits; the redundancy circuit comprises a power supply output end, a backup power supply control module and a backup power supply output module, the power supply output end is electrically connected to a device power supply end; the input end of the backup power supply control module is electrically connected to the power supply output end, the output end of the backup power supply control module is electrically connected to the control end of the backup power supply output module, and the output end of the backup power supply output module is electrically connected to the device power supply end; when the power supply output end cannot output a voltage, the backup power supply control module drives the backup power supply output module to output a voltage to the device power supply end. The application has the effect that the automatic triggering of the backup power supply can be realized at a low cost.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a redundant circuit that automatically triggers a backup power supply. Background Technology

[0002] In many industrial and automation fields, the continuous and stable operation of a system is crucial. Therefore, backup power supplies are typically configured to ensure that equipment can continue to operate normally in the event of a failure of the main power supply.

[0003] To enable rapid switching to backup power in the event of a main power supply failure, power management chips are typically used to control the switching between the main and backup power supplies. However, these chips are relatively expensive. Utility Model Content

[0004] In order to achieve automatic triggering of backup power supply at a low cost, this application provides a redundant circuit for automatically triggering backup power supply.

[0005] The redundant circuit for automatically triggering backup power supply provided in this application adopts the following technical solution:

[0006] A redundant circuit for automatically triggering a backup power supply includes a power supply output terminal, a backup power supply control module, and a backup power supply output module. The power supply output terminal is electrically connected to the device power supply terminal. The input terminal of the backup power supply control module is electrically connected to the power supply output terminal, and the output terminal of the backup power supply control module is electrically connected to the control terminal of the backup power supply output module. The output terminal of the backup power supply output module is electrically connected to the device power supply terminal. When the power supply output terminal fails to output voltage, the backup power supply control module drives the backup power supply output module to output voltage to the device power supply terminal.

[0007] By adopting the above technical solutions, it is possible to ensure that the backup power supply does not output when the power supply is working normally, thereby avoiding unnecessary energy waste; when the power supply fails or cannot supply power, the backup power supply can start, ensuring the continuous operation of the equipment and improving the reliability and stability of the system.

[0008] Preferably, the backup power control module includes a first switching transistor Q1, and the power supply output terminal is electrically connected to the control terminal of the first switching transistor Q1 in sequence through resistors R1 and R2. The output terminal of the first switching transistor Q1 is grounded, and the input terminal of the first switching transistor Q1 is electrically connected to the control terminal of the backup power output module.

[0009] By adopting the above technical solution, when the power supply output terminal can supply power normally, the output voltage of the power supply output terminal turns on the first switching transistor Q1, causing the control terminal of the backup power output module to be grounded. That is, at this time, the backup power output module cannot supply power to the device power supply terminal. When the PWM of the power supply output terminal cannot supply power, the first switching transistor Q1 is turned off, and at this time, the backup power output module can output voltage to the device power supply terminal.

[0010] Preferably, the backup power control module further includes a capacitor C1, one end of which is electrically connected to the connection point of the resistors R1 and R2, and the other end of which is grounded.

[0011] By adopting the above technical solution, capacitor C1 can play a role in filtering and stabilizing voltage, thereby improving the stability of the output voltage at the power supply output terminal.

[0012] Preferably, the backup power control module further includes a diode D1, the positive terminal of which is electrically connected to the power supply output terminal, and the other end of which is electrically connected to the end of resistor R1 away from resistor R2.

[0013] By adopting the above technical solution, diode D1 can prevent reverse current flow and protect other electrical components in the circuit.

[0014] Preferably, the backup power output module includes a backup power output terminal and a second switch Q2. The control terminal of the second switch Q2 is electrically connected to the output terminal of the backup power control module, the backup power output terminal is electrically connected to the input terminal of the second switch Q2, the backup power output terminal is electrically connected to the control terminal of the second switch Q2 through a resistor R3, and the output terminal of the second switch Q2 is electrically connected to the power supply terminal of the device.

[0015] By adopting the above technical solution, when the power supply fails, the backup power control module does not output voltage to the control terminal of the second switching transistor Q2. At this time, the backup power output terminal outputs voltage to the base of the second switching transistor Q2 through resistor R3, which turns on the second switching transistor, thereby enabling the backup power output terminal to output voltage to the equipment power supply terminal, ensuring the stable operation of the equipment.

[0016] Preferably, the backup power output module further includes a diode D3, one end of which is electrically connected to the output terminal of the second switching transistor Q2, and the other end of which is electrically connected to the power supply terminal of the device.

[0017] By adopting the above technical solution, diode D3 can prevent reverse current flow and protect circuit safety.

[0018] Preferably, the device also includes a diode D2, the positive terminal of which is electrically connected to the power supply output terminal, and the negative terminal of which is electrically connected to the device power supply terminal.

[0019] By adopting the above technical solution, diode D2 can prevent reverse current flow and protect circuit safety.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] When the power supply output terminal can supply power normally, the backup power control module controls the backup power output module to have no output, avoiding unnecessary energy loss and improving energy utilization. When the power supply output terminal cannot supply power, the backup power control module controls the output voltage of the backup power output module, realizing a rapid switch to backup power supply and ensuring that the equipment can continue to operate stably when the power supply fails. Attached Figure Description

[0022] Figure 1 This is a circuit diagram of an embodiment of this application.

[0023] Reference numerals: 1. Backup power control module; 2. Backup power output module. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0025] This application discloses a redundant circuit that automatically triggers a backup power supply.

[0026] Reference Figure 1 A redundant circuit for automatically triggering backup power includes a power output terminal PWM, a backup power control module 1, and a backup power output module 2. The power output terminal PWM is electrically connected to the device's power supply terminal POWER, enabling direct power supply. The input terminal of the backup power control module 1 is electrically connected to the power output terminal PWM, and the output terminal of the backup power control module 1 is electrically connected to the control terminal of the backup power output module 2. The output terminal of the backup power output module 2 is electrically connected to the device's power supply terminal POWER. When the power output terminal PWM can supply power normally, the backup power control module 1 controls the backup power output module 2 to have no output; when the power output terminal PWM cannot supply power, the backup power control module 1 controls the backup power output module 2 to output voltage, thereby maintaining power supply to the device.

[0027] The backup power control module 1 includes a diode D1 and a first switching transistor Q1. In this embodiment, the first switching transistor Q1 is an NPN transistor. The power supply output terminal PWM is electrically connected to the anode of diode D1, and the cathode of diode D1 is electrically connected to the base of the first switching transistor Q1 through resistors R1 and R2. The emitter of the first switching transistor Q1 is grounded, and the collector of the first switching transistor Q1 is electrically connected to the control terminal of the backup power output module 2. By setting resistors R1 and R2, current limiting is achieved, thereby keeping the base voltage of the first switching transistor Q1 within its rated range and protecting the first switching transistor Q1. When the power supply output terminal PWM outputs a high level, the base voltage of the first switching transistor Q1 is pulled high, thus turning on the first switching transistor Q1.

[0028] This embodiment also includes diode D2. The PWM power output terminal is electrically connected to the positive terminal of diode D2, and the negative terminal of diode D2 is electrically connected to the POWER power supply terminal of the device. Diodes D1 and D2 are used to prevent reverse connection, thereby protecting the electrical components.

[0029] Preferably, the backup power control module 1 further includes a capacitor C1, one end of which is electrically connected to the connection point between resistors R1 and R2, and the other end of which is grounded. The capacitor C1 serves as a filter and voltage regulator, improving the stability of the PWM output voltage at the power supply output terminal.

[0030] The backup power output module 2 includes a backup power output terminal VSUP, a second switching transistor Q2, and a diode D3. In this embodiment, the second switching transistor Q2 is an NPN transistor. The base of the second switching transistor Q2 is configured as the control terminal of the backup power supply, i.e., the base of the second switching transistor Q2 is electrically connected to the collector of the first switching transistor Q1. The collector of the second switching transistor Q2 is electrically connected to the backup power output terminal VSUP, the emitter of the second switching transistor Q2 is electrically connected to the anode of the diode D3, and the cathode of the diode D3 is electrically connected to the device power supply terminal POWER. Furthermore, the collector of the second switching transistor Q2 is also electrically connected to the base of the second switching transistor Q2 through a resistor R3.

[0031] When the first switch Q1 is in the ON state, the base voltage of the second switch Q2 is pulled low, thus turning the second switch Q2 off. When the first switch Q1 is in the OFF state, the output voltage of the backup power supply output terminal VSUP is output to the base of the second switch Q2 through resistor R3, thus turning the second switch Q2 on. At this time, the output voltage of the backup power supply output terminal VSUP can be output to the device power supply terminal POWER in sequence through the second switch Q2 and diode D2.

[0032] The implementation principle of the redundancy circuit for automatically triggering backup power supply in this application embodiment is as follows: When the power supply output terminal PWM can supply power normally, it can directly output the supply voltage to the device power supply terminal POWER. At the same time, the first switch Q1 is in the on state, and the second switch Q2 is in the off state. When the power supply output terminal PWM does not output, the first switch Q2 is turned off, thereby turning on the second switch Q2. This allows the output voltage of the backup power supply output terminal VSUP to be output to the device power supply terminal POWER, enabling the device to switch to backup power supply in a timely manner when the external power supply fails, so as to maximize the normal function of the device.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A redundancy circuit for automatically triggering a backup power supply, characterized by: The device includes a power supply output terminal, a backup power control module (1), and a backup power output module (2). The power supply output terminal is electrically connected to the device power supply terminal. The input terminal of the backup power control module (1) is electrically connected to the power supply output terminal, and the output terminal of the backup power control module (1) is electrically connected to the control terminal of the backup power output module (2). The output terminal of the backup power output module (2) is electrically connected to the device power supply terminal. When the power supply output terminal cannot output voltage, the backup power control module (1) drives the backup power output module (2) to output voltage to the device power supply terminal. The backup power control module (1) includes a first switching transistor Q1. The power supply output terminal is electrically connected to the control terminal of the first switching transistor Q1 in sequence through resistors R1 and R2. The output terminal of the first switching transistor Q1 is grounded, and the input terminal of the first switching transistor Q1 is electrically connected to the control terminal of the backup power output module (2).

2. The redundancy circuit of claim 1, wherein: The backup power control module (1) also includes a capacitor C1, one end of which is electrically connected to the connection point of the resistor R1 and the resistor R2, and the other end of which is grounded.

3. The redundant circuit of claim 1, wherein: The backup power control module (1) also includes a diode D1, the positive terminal of which is electrically connected to the power supply output terminal, and the other end of which is electrically connected to the end of the resistor R1 away from the resistor R2.

4. The redundant circuit of claim 1, wherein: The backup power output module (2) includes a backup power output terminal and a second switch Q2. The control terminal of the second switch Q2 is electrically connected to the output terminal of the backup power control module (1). The backup power output terminal is electrically connected to the input terminal of the second switch Q2. The backup power output terminal is electrically connected to the control terminal of the second switch Q2 through a resistor R3. The output terminal of the second switch Q2 is electrically connected to the power supply terminal of the device.

5. A redundancy circuit for automatically triggering a backup power supply according to claim 4, characterized in that: The backup power output module (2) also includes a diode D3, one end of which is electrically connected to the output terminal of the second switching transistor Q2, and the other end of which is electrically connected to the power supply terminal of the device.

6. The redundant circuit of claim 1, wherein: It also includes a diode D2, the positive terminal of which is electrically connected to the power supply output terminal, and the negative terminal of which is electrically connected to the device power supply terminal.

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